16556409297 has 12 divisors (see below), whose sum is σ = 25173488080. Its totient is φ = 10456679448.

The previous prime is 16556409257. The next prime is 16556409299. The reversal of 16556409297 is 79290465561.

16556409297 is a `hidden beast` number, since 165 + 56 + 409 + 29 + 7 = 666.

It is not a de Polignac number, because 16556409297 - 2²² = 16552214993 is a prime.

It is a super-2 number, since 2×16556409297² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16556409299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48410383 + ... + 48410724.

Almost surely, 2^16556409297 is an apocalyptic number.

It is an amenable number.

16556409297 is a deficient number, since it is larger than the sum of its proper divisors (8617078783).

16556409297 is a wasteful number, since it uses less digits than its factorization.

16556409297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96821132 (or 96821129 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 16556409297 in words is "sixteen billion, five hundred fifty-six million, four hundred nine thousand, two hundred ninety-seven".